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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1776 (Engine Cooling System) >> Repair Instructions >> Thermostat Replacement (4.2L Engine) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the necessary coolant from the radiator. Refer to Draining and Filling Cooling System .
  2. Remove the generator. Refer to GENERATOR .
  3. Loosen the outlet hose clamp at the thermostat housing (1). Remove the outlet hose from the thermostat housing.
    Fig 1: Removing/Installing Radiator Hose To Thermostat
    GM753670Courtesy of GENERAL MOTORS CORP.
  4. Remove the thermostat housing bolts.
    Fig 2: View Of Thermostat Housing & Bolts
    GM637656Courtesy of GENERAL MOTORS CORP.
  5. Remove the thermostat housing from the engine block.
  6. Clean all of the surfaces of the thermostat housing.
  7. Clean the sealing surface of the engine block.
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